Paul barbe



UNITE STATES PATENT OFFICE PAUL BARBE, F PARIS, FRANCE, AssIGNoR To LAsoorErR ANONYME DYNAMITE NOBEL, or ISLETQN, URI, SWITZERLAND.

CARTRIDGE AND METHOD OF WATERPROOFING THE SAME.

SPECIFICATION forming part of Letters Patent No. 302,819, dated July 29,1884.

Application filed November 28, 1883.

To all; whom, it may concern:

Be itknown that I, PAUL BARBE, engineer, a citizen of the Republic ofFrance, and residing in Paris, France, have invented lmprovements in thellIannfacture of Cartridges, of which the following is a specification.I

The difiiculty of obtaining cartridges'iinpermeable to humidity, andconsequently of avoiding the deterioration that this humidity causes tothe explosive, has suggested a mode ol'prepari ng a water-tightcartridge, for which a patent dated March 13, 1883, N 0. 273,934,

has been obtained. In the description given of the process in the formerpatent only explosives of t pasty or solid nature are referred to. Ithas been found that explosives in a pulverulent state may be prepared ina similar manner; and the object of the present invention is to producea water-tight cartridge, the explosive being in apulverulent orgranulated condition.

The mode of operating is as follows: The pulverulent explosive is firstcompressed in a cylinder of paper, which serves as an envelope. Thispaper may be varnished or not, as desired, or may be plunged or not, asdesired, into pal-affine before use. The extremities of the cylinder ofexplosive may each be covered or not with awad before thefoldingin ofthe ends of the paper tube.

dicated in the patent before mentioned, and is left therein for asufficient] y long time.

It may be mentioned that the bath is formed of a mixture ofparafiine andozocerite, to which (according to the temperature it is desired toattain, the composition of the explosive, or any other circumstances) isadded wax, linseed-oil, resin, colophony, pitch, tar,

The cartridge is then plunged into a bath composed as in- (Nospecimens.) Patented in Eng and June 29, 1883. N0. 3,5339.

essence of turpentine, or any other suitable fatty body, together orseparate. when withdrawn from the bath, is rolled hot in a second paperenvelope previously prepared with the mixture composing the bath. Thissecond. envelope is as thick as maybe desired, and the extremities ofthe tube are folded down in the or'dinar T manner. The heat of thecartridge softens and melts the coating of the second envelope, and whenthe cooling takes place a complete seal is pro dnced between theenvelopes and the surface of the explosive.

Having now described my invention, and explained the manner of intoeffect, I claim- 1. The mode herein described of preparing water-proofcartridges, said mode consisting in first compressing pulverulentexplosive ma terial in an envelope, immersing this in a meltedwaterproofing composition, and then wrapping the coated article whilehot in an envelope which has been previouslysaturated with awaterproofing composition, all substantial] y as set forth.

2. As a new article, a cartridge having a pulverulent explosive materialinelosed in a paper cylinder, both this paper-covered explosive and anouter paper envelope being coated with a composition of parafiine andozoeerite, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two sub-' scribing witnesses.

PAUL BARBE.

\Vitnesses:

ALFRED CAINY, Ron'r. M. HQOPER.

carrying the same k The cartridge,

